In 1 Corinthians 12:1–3, Paul begins an extended discussion of the Holy Spirit and spiritual gifts by addressing a crucial question: How can we know when the Holy Spirit is truly at work? In a church often divided between cynicism and a lack of discernment, Paul reminds believers that we do not have to remain ignorant about the things of the Spirit. In this sermon, Pastor Robb Brunansky examines the importance, illumination, and indicator of the Spirit's work. Unlike the darkness of idolatry, the Holy Spirit brings the light of God's truth, opening our hearts and minds to see the glory of Christ revealed in the gospel. But remarkable experiences, emotional responses, signs, or wonders are not sufficient evidence that the Spirit is at work. Scripture gives us a far more reliable test: Does it exalt Jesus Christ as Lord? The genuine work of the Holy Spirit magnifies Christ, upholds His cross and resurrection, and produces increasing love for, allegiance to, and obedience to Him.